Shimano Altus FD-M313 Front Derailleur – 7/8-Speed, Triple, Dual Pull, Down Swing
The Shimano Altus FD-M313 is a reliable front derailleur designed for 7 and 8-speed triple drivetrain systems. Built for durability and broad compatibility, it features a dual-pull design and multi-clamp sizing to fit a wide range of frames.
Key Functional Details
- Compatible with 7 and 8-speed triple drivetrains
- Down-swing (bottom swing) design for stable shifting
- Dual-pull cable routing (top or bottom pull compatible)
- Supports chainrings up to 48T
- 20T total capacity for triple cranksets
- Multi-size clamp compatibility (28.6 / 31.8 / 34.9mm)
- Designed for Shimano MTB shifter systems
Technical Specifications
| Brand | Shimano |
| Model | Altus FD-M313 |
| Speeds | 7 / 8-speed |
| Drivetrain Type | Triple (3x) |
| Max Chainring | 48T |
| Total Capacity | 20T |
| Pull Type | Dual Pull (Top / Bottom) |
| Mount Type | Clamp-On |
| Clamp Sizes | 28.6mm / 31.8mm / 34.9mm |
| Style | Down Swing (Bottom Swing) |
| Compatibility | Shimano MTB Systems |
| UPC | 689228610873 |
Compatibility & Technical Notes
Good Fit:
- 7 or 8-speed Shimano-compatible drivetrains
- Triple cranksets (3x systems)
- MTB, hybrid, and comfort bikes
- Frames requiring clamp-on front derailleurs
- Bikes with top-pull or bottom-pull cable routing
Not A Fit:
- 2x (double) cranksets
- 9, 10, 11, or 12-speed drivetrains
- Braze-on only frames (without adapter)
- Chainrings larger than 48T
Ensure clamp size matches your seat tube diameter and that cable routing aligns with your frame setup.
Service / Ownership Context
Installation requires proper height and angle alignment relative to the chainrings. Fine-tuning limit screws and cable tension is critical for smooth shifting. Works best when paired with a properly sized chain and unworn drivetrain components.
Fit & Use Signals
- Ideal for restoring or repairing older 3x drivetrains
- Common replacement for worn or bent front derailleurs
- Good for budget MTB and hybrid builds
- Flexible fit across many frame types due to dual-pull design
Biggest issue is mismatch between triple vs double—customers often try to use this on 2x setups and shifting will be poor. Dual pull is a major advantage—works on most frames, but confirm cable routing before install. Clamp sizing is critical—measure seat tube or check old derailleur. Setup matters more than the part—incorrect height or angle will cause chain rub and poor shifting. Always inspect chain and chainrings—worn drivetrain will make even a new derailleur shift poorly.